question_answer

A current carrying wire LN is bent in the from shown below. If wire carries a current of 10 A  and it is placed in a magnetic field of 5 T which acts perpendicular to the paper outwards then it will experience a force

A) Zero                             

B) 5N

C) 30 N                

D) 20 N

Correct Answer: B

Solution :

The given wire can be replaced by a straight wire as shown below. Hence force experienced by the wire \[\operatorname{F}=Bil=5\,\,\times \,\,10\times 0.1 =5 N\]